Strands of blue-hued noctilucent clouds (NLCs) shine low in the northeastern sky about 1 hour 40 minutes before sunrise on July 3. NLCs are the highest clouds in Earth's atmosphere and form between 47 ...
These noctilucent clouds, reflecting light from the sun after sunset, have been visible in Martian skies for the past four fall seasons. Credit: NASA / JPL-Caltech / MSSS A rover got a new view of ...
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